#ifndef BASE_IPADDRESS_H_
#define BASE_IPADDRESS_H_

#ifdef POSIX
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#endif
#ifdef WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#include <string.h>
#include <string>
#include <vector>

#include "basictypes.h"
#include "byteorder.h"
#ifdef WIN32
#include "win32.h"
#endif

namespace base {

	// Version-agnostic IP address class, wraps a union of in_addr and in6_addr.
	class IPAddress {
	public:
		IPAddress() : family_(AF_UNSPEC) {
			::memset(&u_, 0, sizeof(u_));
		}

		explicit IPAddress(const in_addr &ip4) : family_(AF_INET) {
			memset(&u_, 0, sizeof(u_));
			u_.ip4 = ip4;
		}

		explicit IPAddress(const in6_addr &ip6) : family_(AF_INET6) {
			u_.ip6 = ip6;
		}

		explicit IPAddress(uint32 ip_in_host_byte_order) : family_(AF_INET) {
			memset(&u_, 0, sizeof(u_));
			u_.ip4.s_addr = HostToNetwork32(ip_in_host_byte_order);
		}

		IPAddress(const IPAddress &other) : family_(other.family_) {
			::memcpy(&u_, &other.u_, sizeof(u_));
		}

		~IPAddress() {}

		const IPAddress & operator=(const IPAddress &other) {
			family_ = other.family_;
			::memcpy(&u_, &other.u_, sizeof(u_));
			return *this;
		}

		bool operator==(const IPAddress &other) const;
		bool operator!=(const IPAddress &other) const;
		bool operator <(const IPAddress &other) const;
		bool operator >(const IPAddress &other) const;
		friend std::ostream& operator<<(std::ostream& os, const IPAddress& addr);

		int family() const { return family_; }
		in_addr ipv4_address() const;
		in6_addr ipv6_address() const;

		// Returns the number of bytes needed to store the raw address.
		size_t Size() const;

		// Wraps inet_ntop.
		std::string ToString() const;

		// Returns an unmapped address from a possibly-mapped address.
		// Returns the same address if this isn't a mapped address.
		IPAddress Normalized() const;

		// Returns this address as an IPv6 address.
		// Maps v4 addresses (as ::ffff:a.b.c.d), returns v6 addresses unchanged.
		IPAddress AsIPv6Address() const;

		// For socketaddress' benefit. Returns the IP in host byte order.
		uint32 v4AddressAsHostOrderInteger() const;

	private:
		int family_;
		union {
			in_addr ip4;
			in6_addr ip6;
		} u_;
	};

	bool IPFromAddrInfo(struct addrinfo* info, IPAddress* out);
	bool IPFromString(const std::string& str, IPAddress* out);
	bool IPIsAny(const IPAddress& ip);
	bool IPIsLoopback(const IPAddress& ip);
	bool IPIsPrivate(const IPAddress& ip);
	bool IPIsUnspec(const IPAddress& ip);
	size_t HashIP(const IPAddress& ip);

	// These are only really applicable for IPv6 addresses.
	bool IPIs6Bone(const IPAddress& ip);
	bool IPIs6To4(const IPAddress& ip);
	bool IPIsSiteLocal(const IPAddress& ip);
	bool IPIsTeredo(const IPAddress& ip);
	bool IPIsULA(const IPAddress& ip);
	bool IPIsV4Compatibility(const IPAddress& ip);
	bool IPIsV4Mapped(const IPAddress& ip);

	// Returns the precedence value for this IP as given in RFC3484.
	int IPAddressPrecedence(const IPAddress& ip);

	// Returns 'ip' truncated to be 'length' bits long.
	IPAddress TruncateIP(const IPAddress& ip, int length);
	// Returns the number of contiguously set bits, counting from the MSB in network
	// byte order, in this IPAddress. Bits after the first 0 encountered are not
	// counted.
	int CountIPMaskBits(IPAddress mask);
}  // namespace base

#endif  // BASE_IPADDRESS_H_
